More Problems

• Write a program to find the sum of all prime numbers up to a given limit using the Sieve of Eratosthenes.
• Write a program to implement a simple text-based RPG with combat and leveling up.
• Write a program to check if a number is a perfect square using binary search.
• Write a program to find the longest palindromic substring using a center-expansion technique.
• Write a program to implement a basic hash table with chaining for collision resolution.
• Write a program to check if a string is a valid phone number format.
• Write a program to find the total number of islands in a 2D binary matrix.
• Write a program to implement a simple chat application with a user interface.